Circuit-breaker.



WITNESSES I V I INVENTOR I W /ZZ'J', #0145 H. E. HOWE.

CIRCUIT BREAKER. APPLICATION FILED DEC. 4, 1911.

1,021,604. Ptgnted Mar.26, 1912.

ATTORNEYS HARVEY E. HOWE, 0F WINDBER, PENNSYLVANIA.

CIRCUIT-BREAKER.

Specification of Letters Patent.

Application filed December 4, 1911.

Patented Mar. 26, 1912. Serial No. 663,705.

To all whom it may concern:

Be it known that I, HARVEY E. I-Iown, a citizen of the United States ofAmerica, residing at VVindber, in the county of Somerset and State ofPennsylvania, have invented certain new and useful Improvements inCircuit-Breakers, of which the following is a specification, referencebeing had therein to the accompanying drawing.

This invention relates to circuit breakers, and more particularly tocertain improvements upon Patent No. 9%),537, granted February 15, 1910and Patent No. 950,922 granted March 1, 1910. i

The primary object of the present invention is to provide a simple andinexpensive circuit breaker that can be advantageously used in mines andin connection with industrial electric railways for controlling thecircuits over various sections of a railway.

Another object of this invention is to provide a section breaker thatprovides a continuous passage for a trolley wheel from one section ofthe wire to another, the passage being formed by a rail or shoe carriedby a knife switch that controls the passage of an electric current fromone section of trolley wire to another.

I attain the above objects by a mechanical construction that will behereinafter specifically described and then claimed, and reference willnow be had to the drawing, where m:-

Figure 1 is a side elevation of the circuit breaker. Fig. 2 is a crosssectional view of the same, and Fig. 3 is a perspective view of adetached switch blade.

The reference numeral 1 denotes a flat plate preferably made of wood,although other insulation, as fiber can be used.

2 denotes a hanger riveted or otherwise connected, as at 3 to the upperedge of the plate 1, intermediate the ends thereof. This hanger isadapted to be supported'from the roof or timbers of a mine.

4. denotes wire holders riveted or otherwise connected, as at 5 to theends of the plate 1, said holders being made of metal and incasing theends of the plate. The holders 4 have extensions 6 provided with sockets7 for the bent ends 8 of trolley wires or electric conductors 9. Thelower edges of the extensions 6 are grooved, as at 10 to receive thewires 9 and the lower inner edges of the holders 4 are rounded, as

one of the holders 4 and pivotally mounted in said bearings by a bolt 15and a nut 16 isthe apertured end 17 of a switch blade 18. The switchblade 18 has a handle 19 and a shield or disk 20, both of which are madeof an insulating material, as hard rubber. The shield 20 prevents thehand gripping the handle 19 from contacting with 'the blade 18. 21denotes yieldable or resilient contact arms carried by the other wireholder to receive the blade 18 and establish an electrical connectionbetween the wire holders 4.

22 denotes a rail or shoe having the ends thereof provided with arms 23riveted or otherwise connected, as at 2& to the blade 18. The shoe 22 isof a length corresponding to the gap 12 and said shoe has the under sidethereof rounded, as at 25 to represent a continuation of the lower edgesof the wire holders 4. The arms 23 of the shoe are disposed at an angleto the switch blade 18 whereby said shoe can engage the lower bevelededge of the plate 1, said shoe representing that portion of the plateremoved to provide the beveled edge. words, the shoe completes the platewhen the switch blade is closed, thereby providing a continuous metallicrail from one trolley wire to the other.

When the switch is swung to an open position, the shoe 22 is removed,opening the gap and one trolley wire is independent of the other withthe electric circuit broken.

That I claim is 1. In a circuit breaker, a plate of insulation, trolleywire holders carried by the ends thereof, a knife switch forestablishing an electrical connection between said holders, and a shoecarried by the blade of said switch to bridge the gap between saidholders.

2. In a circuit breaker, a plate of insulation, trolley wire holderscarried by the ends thereof and providing a gap cent-rally of the loweredge of said plate, a switch blade pivotally connected to one of saidholders, con

tact arms carried by the other holderto re- In other ceive said bladeand establish an electric of said switch to bridge the gap between saidconnection between said holders, and a shoe holders. 10 carried by saidblade and adapted to bridge In testimony whereof I aflix my signaturethe gap between said holders. in the presence of two witnesses.

3. In a circuit breaker trolley wire hold HARVEY E. HOWE. ers providinga gap, a knife switch adapted lVit-nesses: to provide an electricalconnection between Jos. T. MCCORMICK, said holders and a shoe carried bythe blade J. H. HUMMELL.

Copies 01 this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

